Yes it's easy to install, no it's not 100W. The volume of both pas and siren is very low. Testing indoors with 12 volts seems very noisy, but once installed under the hood of a car, it is not noisy and cannot be heard by other cars. The siren is also large, there is not much space under the hood in modern cars. Wasn't expecting much for the price, will probably send it back.
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